As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN FILLED WITH VERY STRONG DIRTY SOCK SMELL ON DESCENT. MAINTENANCE REMOVED AND REPLACED THE APU. ALSO FOUND BLUE HYDRAULIC MANIFOLD LEAKING AT HP FILTER 2048GM - SECURED MANIFOLD WITH NO FURTHER LEAKS. VENDOR CONFIRMED THE FAILURE OF THE APU DUE TO LOAD COMPRESSOR SEAL LEAKAGE.